(LAS VEGAS CBS KXNT) “Green” doesn’t always indicated an environmental benefit. A swimming pool abandoned to summer heat is a perfect place for mosquitoes to breed, according to Clark County officials. The county is encouraging neighbors, inspectors, realtors, and others to report green pools.

The county code enforcement squads have drained more than 350 such pools since 2010, in an effort to reduce the number of West Nile virus cases in the valley. Last year, 11 cases of West Nile were reported in Clark County.

Green pools can be reported by calling the county, or by filing a complaint on the county’s website.